I-Line™ Busway offers a complete line of compatible, sandwich-type feeder and plug-in busway lengths and fittings. I-Line plug-in busway has options from 225A to 600A with aluminum or copper conductors. These busways are constructed in three-pole and four-pole neutral configurations for system voltages of 600 volts and are rated to allow 100% of the current to flow. This plug-in tap box is rated 800A to 1600A, that is ideal for 3 phase, 4 wire commercial or industrial applications. As an accessory, it is designed to be plugged into the side of the busway (at any opening except the very last opening of a run). This plug in tap box can be used with aluminum or copper busways. This unit is for vertical mounting. This plug in tap box meets the UL 857 standard, the CSA C22.2 No 27 standard and the IEC 61439-6 standard.